//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  All rights reserved.
//
//	Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//	Redistributions of source code must retain the above copyright notice,
//  this list of conditions and the following disclaimer.
//	Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//	Neither the name of the Drew Davidson nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
//  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
//--------------------------------------------------------------------------
package org.more.ognl;
import java.util.ArrayList;
import java.util.List;
@SuppressWarnings({ "rawtypes", "unchecked" })
public final class EvaluationPool extends Object {
    private List evaluations = new ArrayList();
    private int  size        = 0;
    private int  created     = 0;
    private int  recovered   = 0;
    private int  recycled    = 0;
    public EvaluationPool() {
        this(0);
    }
    public EvaluationPool(int initialSize) {
        super();
        for (int i = 0; i < initialSize; i++) {
            evaluations.add(new Evaluation(null, null));
        }
        created = size = initialSize;
    }
    /**
        Returns an Evaluation that contains the node, source and whether it
        is a set operation.  If there are no Evaluation objects in the
        pool one is created and returned.
     */
    public Evaluation create(SimpleNode node, Object source) {
        return create(node, source, false);
    }
    /**
        Returns an Evaluation that contains the node, source and whether it
        is a set operation.  If there are no Evaluation objects in the
        pool one is created and returned.
     */
    public synchronized Evaluation create(SimpleNode node, Object source, boolean setOperation) {
        Evaluation result;
        if (size > 0) {
            result = (Evaluation) evaluations.remove(size - 1);
            result.init(node, source, setOperation);
            size--;
            recovered++;
        } else {
            result = new Evaluation(node, source, setOperation);
            created++;
        }
        return result;
    }
    /** Recycles an Evaluation */
    public synchronized void recycle(Evaluation value) {
        if (value != null) {
            value.reset();
            evaluations.add(value);
            size++;
            recycled++;
        }
    }
    /** Recycles an of Evaluation and all of it's siblings and children. */
    public void recycleAll(Evaluation value) {
        if (value != null) {
            recycleAll(value.getNext());
            recycleAll(value.getFirstChild());
            recycle(value);
        }
    }
    /** Recycles a List of Evaluation objects */
    public void recycleAll(List value) {
        if (value != null)
            for (int i = 0, icount = value.size(); i < icount; i++)
                recycle((Evaluation) value.get(i));
    }
    /** Returns the number of items in the pool */
    public int getSize() {
        return size;
    }
    /** Returns the number of items this pool has created since it's construction. */
    public int getCreatedCount() {
        return created;
    }
    /** Returns the number of items this pool has recovered from the pool since its construction. */
    public int getRecoveredCount() {
        return recovered;
    }
    /** Returns the number of items this pool has recycled since it's construction. */
    public int getRecycledCount() {
        return recycled;
    }
}
